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rdf:type |
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lifeskim:mentions |
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pubmed:issue |
1
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pubmed:dateCreated |
1983-3-24
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pubmed:abstractText |
Photolysis of HbCO, MbCO, and CO-protoheme has been investigated by measuring transient differential spectra and kinetics of induced absorption after excitation with a 250-fsec laser pulse at 307 nm. Probing was performed by a part of a continuum pulse between 395 and 445 nm. Photodissociation of the three liganded species occurred within the pulse duration. By contrast, the formation of deoxy species appeared with a mean (+/- SD) response time of 350 +/- 50 fsec. This time constant was identical for the three species and independent of the presence or absence of the protein structure. Our results suggest the formation of a transient high-spin in plane iron (II) species which relaxes in 350 fsec to a high-spin stable state with concerted kinetics of CO departure and iron displacement. The spin transition is suspected to occur via liganded excited states which relax in part to non-reactive states with a 3.2-psec time constant.
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pubmed:commentsCorrections |
http://linkedlifedata.com/resource/pubmed/commentcorrection/6571992-13947738,
http://linkedlifedata.com/resource/pubmed/commentcorrection/6571992-16592986,
http://linkedlifedata.com/resource/pubmed/commentcorrection/6571992-273220,
http://linkedlifedata.com/resource/pubmed/commentcorrection/6571992-382987,
http://linkedlifedata.com/resource/pubmed/commentcorrection/6571992-533895,
http://linkedlifedata.com/resource/pubmed/commentcorrection/6571992-5857919,
http://linkedlifedata.com/resource/pubmed/commentcorrection/6571992-618546,
http://linkedlifedata.com/resource/pubmed/commentcorrection/6571992-6932659,
http://linkedlifedata.com/resource/pubmed/commentcorrection/6571992-6941287,
http://linkedlifedata.com/resource/pubmed/commentcorrection/6571992-6950394,
http://linkedlifedata.com/resource/pubmed/commentcorrection/6571992-7074195,
http://linkedlifedata.com/resource/pubmed/commentcorrection/6571992-935853
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pubmed:language |
eng
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pubmed:journal |
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pubmed:citationSubset |
IM
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pubmed:chemical |
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pubmed:status |
MEDLINE
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pubmed:month |
Jan
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pubmed:issn |
0027-8424
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pubmed:author |
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pubmed:issnType |
Print
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pubmed:volume |
80
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
173-7
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pubmed:dateRevised |
2010-9-13
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pubmed:meshHeading |
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pubmed:year |
1983
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pubmed:articleTitle |
Femtosecond photolysis of CO-ligated protoheme and hemoproteins: appearance of deoxy species with a 350-fsec time constant.
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pubmed:publicationType |
Journal Article,
Research Support, Non-U.S. Gov't
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